title: Common features of simple water models.
abstract: We compare three different simple models for water. They all show a phase behavior and anomalies that are characteristic of water. We compare these models and their features and evaluate the phase diagram, the density anomaly, and the liquid-liquid transition line. Additionally, we show that the characteristic behavior present in all three models can be deduced from the fact that all three models include three microscopic states for nearest neighbor configurations. We therefore propose an even simpler three-state model for water that still captures the phase transitions and the density anomaly. Finally, we show that this simple three-state model shows in fact all four possible scenarios discussed in the literature for the phase behavior of liquid water, if the parameters are adjusted accordingly.
authors.affiliation: Institut für Festkörperphysik, Technische Universität Darmstadt, Hochschulstr. 6, 64289 Darmstadt, Germany. lotta@fkp.tu-darmstadt.de
authors.forename: Lotta
authors.initials: L
authors.lastname: Heckmann
authors.forename: Barbara
authors.initials: B
authors.lastname: Drossel